linux-kernel - Re: general protection fault in vmx_vcpu

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Message-ID: <CACT4Y+bnUNtn3jO5fYMB5dSqA=vbc8KfnTmbajA6SYKex4KFoQ@mail.gmail.com>
Date:   Thu, 28 Jun 2018 07:27:13 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+cc483201a3c6436d3550@...kaller.appspotmail.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, KVM list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: general protection fault in vmx_vcpu_run

On Sat, Apr 14, 2018 at 3:07 AM, syzbot
<syzbot+cc483201a3c6436d3550@...kaller.appspotmail.com> wrote:
> syzbot has found reproducer for the following crash on upstream commit
> 1bad9ce155a7c010a9a5f3261ad12a6a8eccfb2c (Fri Apr 13 19:27:11 2018 +0000)
> Merge tag 'sh-for-4.17' of git://git.libc.org/linux-sh
> syzbot dashboard link:
> https://syzkaller.appspot.com/bug?extid=cc483201a3c6436d3550
>
> So far this crash happened 4 times on upstream.
> C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6257386297753600
> syzkaller reproducer:
> https://syzkaller.appspot.com/x/repro.syz?id=4808329293463552
> Raw console output:
> https://syzkaller.appspot.com/x/log.txt?id=4943675322793984
> Kernel config:
> https://syzkaller.appspot.com/x/.config?id=-5947642240294114534
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+cc483201a3c6436d3550@...kaller.appspotmail.com
> It will help syzbot understand when the bug is fixed.

#syz dup: BUG: unable to handle kernel paging request in vmx_vcpu_run


> IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
> 8021q: adding VLAN 0 to HW filter on device team0
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] SMP KASAN
> Dumping ftrace buffer:
>    (ftrace buffer empty)
> Modules linked in:
> CPU: 0 PID: 6472 Comm: syzkaller667776 Not tainted 4.16.0+ #1
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:vmx_vcpu_run+0x95f/0x25f0 arch/x86/kvm/vmx.c:9746
> RSP: 0018:ffff8801c95bf368 EFLAGS: 00010002
> RAX: ffff8801b44df6e8 RBX: ffff8801ada0ec40 RCX: 1ffff100392b7e78
> RDX: 0000000000000000 RSI: ffffffff81467b15 RDI: ffff8801ada0ec50
> RBP: ffff8801b44df790 R08: ffff8801c4efe780 R09: fffffbfff1141218
> R10: fffffbfff1141218 R11: ffffffff88a090c3 R12: ffff8801b186aa90
> R13: ffff8801ae61e000 R14: dffffc0000000000 R15: ffff8801ae61e3e0
> FS:  00007fa147982700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 00000001d780d000 CR4: 00000000001426f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> Code: 8b a9 68 03 00 00 4c 8b b1 70 03 00 00 4c 8b b9 78 03 00 00 48 8b 89
> 08 03 00 00 75 05 0f 01 c2 eb 03 0f 01 c3 48 89 4c 24 08 59 <0f> 96 81 88 56
> 00 00 48 89 81 00 03 00 00 48 89 99 18 03 00 00
> RIP: vmx_vcpu_run+0x95f/0x25f0 arch/x86/kvm/vmx.c:9746 RSP: ffff8801c95bf368
> ---[ end trace ffd91ebc3bb06b01 ]---
> Kernel panic - not syncing: Fatal exception
> Shutting down cpus with NMI
> Dumping ftrace buffer:
>    (ftrace buffer empty)
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
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